Install 100L hot water boiler without expansion tank

Small addendum: it does not necessarily have to be higher, it is only to prevent too high pressure in the cold water area at the fitting during mixed operation. For the power hog, a separate supply line should be laid with its own fused RCD. If it is a longer supply line, 3x2.5 NYM.

Hi

You can operate a pressure-resistant storage tank with a suitable safety valve.
An expansion vessel is not necessary.

Olli

Here, however, a pressure accumulator is to be operated with a [DRUCKLOSEN] valve.

Hi

I understand the background of the question rather as the entire pressureless effort was made because of the lack of space for a MAG.

Olli

In pressure operation, an expansion vessel can be omitted, although 8l would be too small anyway, but only with a safety valve as proposed is not really satisfactory. This would have to release constantly from 4 bar, even if the storage tank is not heating up. So we also need a pressure reducer and a non-return valve in addition. Water will still escape from the safety valve from 4 bar. Certain rules must also be observed during installation by the expert. The Te. wants to implement everything with minimal effort. That's how I understood it. But it probably doesn't matter, the TE. apparently is no longer interested.